4 VS VMware Requirements Important: Vocera DOES NOT support any other virtualization environments, including VMware Server/Workstation, Citrix XenServer, Red Hat KVM and Microsoft Hyper-V. Component Vocera Server Version Processor Type Requirements Version 4.3 or 4.4 with latest service pack Intel Xeon Processors per VM 4 Minimum RAM Resource Reservation 8 GB See CPU Oversubscription on page 5 and Memory Oversubscription on page 5 Network Interface VMXNET 3 Minimum Disk Space Guest Operating System 120 GB (thick provisioned) Windows 2008 R2 Standard Important: Vocera has validated that the Vocera Server works with the above requirements. However, we understand that every virtual infrastructure has unique characteristics. Consequently, you may need to deviate from the required configuration. If you encounter performance issues with virtualized Vocera Servers, Vocera Technical Support will work with your VMware administrator to help identify the cause of the problem and make recommendations to help fix or mitigate the problem. The recommendation could be to move the Vocera Server to a host with more available resources or higher performing disk capabilities. In some cases, Vocera Technical Support may recommend migrating to physical hardware if the virtual environment is not able to maintain the level of performance required by the Vocera solution. Disk Oversubscription No disk oversubscription is allowed on the host All virtual disks should use a thick provisioning method Only direct-attached storage is supported NAS or SAN hosted disks are not currently supported 4 Vocera Voice 4.3 and 4.4 Server Sizing Matrix, 01/20/2014

5 CPU Oversubscription No CPU oversubscription is allowed on the host Each provisioned virtual CPU must map one-to-one to a physical CPU core One physical CPU must be reserved for the hypervisor CPU affinity is not required or recommended Hyper-threading can be enabled but additional logical processors made available via the hyper-threading feature do not count toward the provisioning totals Example: Host machine contains 2 quad-core processors with hyper-threading enabled. Physical CPUs = 8 Logical CPUs = 16 Maximum vcpu s allowed = 7 (8 1 reserved for hypervisor use) Memory Oversubscription No memory oversubscription is allowed on the host All hosts must have a memory reservation configured equal to the provisioned amount of RAM on the guest 1 GB of RAM should be reserved for the hypervisor Example: Host machine contains 24 GB of RAM 24 1 = 23 GB of RAM available for guest VMs memory allocation Applications Running on the Same Physical Host Only the following applications are supported running on the same host as a virtualized Vocera Server: VS (staging) VSTG VCG VRS Important: For hardware redundancy, Vocera recommends a separate physical host for each Vocera Server cluster node. Vocera Voice 4.3 and 4.4 Server Sizing Matrix, 01/20/2014 5

7 When you configure the Number of Lines field on the Telephony > Basic Info page of the Vocera Administration Console, enter the number of lines available to a single VSTG server, not the total number of lines available to all servers. For example, if you purchased a license with 6 lines and you have 2 VSTG servers, assign 3 lines to each VSTG server. VCG Recommendations You can install up to 4 VCG servers for your Vocera system to take advantage of high availability features. Vocera recommends the following best practices for high availability: Set up 2 separate VMware ESX servers for redundancy. Install VCG on each VMware ESX server. VSTG and VCG Limits Number of lines supported by a single VSTG 128 Number of clients supported by a single VCG 500 Number of simultaneous audio sessions supported by a single VCG 256 Managing CPU and Memory Resources Vocera VMware Architecture When setting up VMs for Vocera servers, make sure you specify CPU and memory resource reservations. A reservation specifies the guaranteed minimum allocation for a VM. CPU and memory resource reservations ensure that the VM will have enough CPU and memory resources provided by the host or cluster. If you don't specify CPU and memory resource reservations, the VM environment could become stressed, causing the clock on the VM to slow down or speed up, which could cause a Vocera SIP Telephony Gateway or Vocera Client Gateway to disconnect from its Vocera Server. The following diagram shows two VMware ESXi hosts for a Vocera Server cluster. The hosts also include VMs for VSTG, VCG, VRS and a Vocera Server staging server. Based on server load, you can add more VCG and VSTG VMs as well as distributed Vocera Recognition Server VMs. Vocera Voice 4.3 and 4.4 Server Sizing Matrix, 01/20/2014 7

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